To the best of my knowledge, most Avocados are grown in the warm-winter
areas of California, Hawaii and the southern part of Florida.
So I would think that the chances of long term survival outdoors in your area is very iffy.
I live in the very southern-most part of North Carolina, and they are not hardy here.

However, I have read of a Mexican variety which is hardy to about 20Â°F,
so if you don't mind taking a chance, you could give it a try,
maybe yours would turn out to be one of that type. :-D

Fruit production would be another subject, completely.
There are some varieties that require 6 months,
and others that take as long as 12 - 18 months from pollination to ripen.

I have 2 of them growing in a large pot. I will put them inside the hot house this winter.I've heard that some people wrap 2 or 3 strands of Xmas outdoor little light bulbs around banana trees and leave them on and they live so maybe you could try that.